Hinge positioning structure and unit

A hinge positioning structure comprising:

• a base defining a positioning groove and forming a protrusion;
• a pivot shaft rotatably engaged in the base;
• a pivot shaft gripper sleeved on the pivot shaft, an end of the pivot shaft gripper engaged with the base so that part of the pivot shaft gripper is fixed relative to the base, the pivot shaft gripper comprising a first end and a second end, the second end of the pivot shaft gripper engaged in the positioning groove of the base such that the second end is non-rotatable relative to the base, the pivot shaft gripper forming a hook at a distal end of the first end;
• and
• a resilient member comprising a first ring and a second ring formed at two distal ends thereof, the first and second rings of the resilient member engage with the hook of the pivot shaft gripper and the protrusion of the base respectively, two ends of the resilient member connected to the base and another end of the pivot shaft gripper, respectively, the resilient member applying a force on the pivot shaft gripper so that the pivot shaft gripper tightly grips on the pivot shaft, such that the pivot shaft is incapable of rotating in a predetermined direction relative to the base, and the pivot shaft gripper being relaxed by an external force for allowing the pivot shaft to rotate relative to the base.